group one alkali metals IGCSE (1).ppt

Description of group one alkali metals. Introduction of all the metals followed by properties

1. Groups 1 - the Alkali Metals

2. starter
•What is the name of the group 1 elements?
•Name 3 of these elements.
•If one of these elements has the symbol and
atomic number and mass
• Na
•What are the number of protons, neutrons and
electrons in this atom?
•What is the electron arrangement in this atom
and how do we know what group we should
place it in?
23
11

3. answers
•What is the name of the group
1 elements?
•Name 3 of these elements.
•If one of these elements has
the symbol and atomic number
and mass
• Na
•What are the number of
protons, neutrons and
electrons in this atom?
•What is the electron
arrangement in this atom and
how do we know what group
we should place it in?
•Alkali metals
•Lithium, sodium, potassium,
rubidium, caesium, francium
•Protons = 11
•Neutrons = 12
•Electrons = 11
•2,8,1
•Placed in group 1 as the atom
has one electron in its outer
shell
23
11

4. Group 1 – The alkali metals

5. Group 1 – The alkali metals
Li
Na
K
Rb
Cs
Fr

6. Groups 1 and 2
•Groups 1 and 2 are always found in nature
combined with other elements.
•They’re called active metals because of their
readiness to form new substances with other
elements.
•They are all metals except hydrogen, the first
element in Group 1.
Representative Elements

7. low densities and low
melting points.
•All the alkali metals are silvery solids with
Alkali Metals
•The Group 1 elements have a specific family
name—alkali metals.
•These elements increase in
their reactivity, or tendency
to combine with other
substances, as you move
from top to bottom.

8. Walt and WILF
•WALT
•Different elements have different properties related to
their position in the Periodic Table
•WILF
•Locate the position in the Periodic Table of the alkali
metals.
•Recall how the alkali metals react with water and how
this reaction changes as we travel down the group.
•Recall whether these reactions are endothermic or
exothermic.

9. Group 1 – The alkali metals
1) These metals all have ___
electron in their outer shell
Some facts…
2) Reactivity increases as you go _______ the group. This is
because the electrons are further away from the _______
every time a _____ is added, so they are given up more easily.
3) They all react with water to form an alkali (hence their
name) and __________, e.g:
Words – down, one, shell, hydrogen, nucleus
Potassium + water potassium hydroxide + hydrogen
2K
(s) + 2H
2O
(l) 2KOH
(aq) + H
2(g)

10. Plenary 1.
•Predict
•What would happen if rubidium was added
to water.
•1. how fast will it react?
•2. Will it be endothermic or exothermic?
•3. What gas will be formed?
•4. What would be the word equation

11. Plenary 2.
•Predict
•What would happen if caesium was added
to water.
•1. how fast will it react?
•2. Will it be endothermic or exothermic?
•3. What gas will be formed?
•4. What would be the word equation?

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